Very clever! The web version was slightly frustrating to play because my mouse kept leaving the window and messing up the aiming. But I'm sure had I played the windows version it would have been fine. But nevertheless I enjoyed it!
Thanks Firebelley! It's an honor to me have your feedback, since all i know about Godot i learned with you :).
About the mouse issue, yeah, i leave a disclaimer in the game page alerting this. The Windows version you cam aim even if your cursor is outside the game canvas.